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Simplifying 3x + 15 = -1(x + 7) Reorder the terms: 15 + 3x = -1(x + 7) Reorder the terms: 15 + 3x = -1(7 + x) 15 + 3x = (7 * -1 + x * -1) 15 + 3x = (-7 + -1x) Solving 15 + 3x = -7 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 15 + 3x + x = -7 + -1x + x Combine like terms: 3x + x = 4x 15 + 4x = -7 + -1x + x Combine like terms: -1x + x = 0 15 + 4x = -7 + 0 15 + 4x = -7 Add '-15' to each side of the equation. 15 + -15 + 4x = -7 + -15 Combine like terms: 15 + -15 = 0 0 + 4x = -7 + -15 4x = -7 + -15 Combine like terms: -7 + -15 = -22 4x = -22 Divide each side by '4'. x = -5.5 Simplifying x = -5.5
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